Abstract: Compared with the voided slab bridge with common deck pavement, the deck pavement of the voided slab bridge with integrated pavement is thicker, and the transverse integrity is more prominent. Therefore, the influence of integrated pavement must be taken into consideration in the calculation of the transverse load distribution factor. In this paper, the Generalized Grillage Method（GGM） is proposed to calculate the transverse load distribution factor of the voided slab bridge strengthened by integrated deck pavement. Based on the full-scale model test and finite element calculations, the transverse load distribution factor calculation method for voided slab bridges strengthened by the integrated pavement based on GGM is validated. The transverse load distribution factor calculation results indicate that GGM can precisely consider the transverse load distribution law of the voided slab bridges strengthened by integrated pavement. The different beam height reduction coefficients calculation and comparison with experimental and finite element results indicate that for voided slab bridges with different widths and spans, the calculation results are more accurate when the height reduction coefficient of the pavement layer is between 0.5 and 0.8. The wider the bridge, the larger the reduction coefficient value. The larger the span, the smaller the reduction coefficient value.